一种新型镍基粉末高温合金涡轮盘的双性能热处理工艺研究
Dual-Microstructure Heat Treatment Process for Novel Nickel-Based Powder Metallurgy Superalloy Turbine Disk
程俊义 1刘朝峰 1马向东 2肖磊 2郭建政 1冯干江1
作者信息
- 1. 中南大学粉末冶金国家重点实验室,湖南长沙 410083;深圳市万泽中南研究院有限公司,广东深圳 518035
- 2. 中南大学粉末冶金国家重点实验室,湖南长沙 410083
- 折叠
摘要
采用真空感应熔炼+制粉+热等静压+热挤压+等温锻工艺制备实验盘坯,在实验盘坯上取样并进行热处理和力学性能测试,得到合金FGH4113A的亚固溶和过固溶热处理温度范围和力学性能变化规律.同时,通过测温实验验证仿真模拟的热边界条件.随后,提出了一种基于实验和有限元分析方法设计盘轴一体化镍基粉末高温合金涡轮盘的热处理工艺方法.最后,采用该方法制定的热处理工艺,成功地制备出了大尺寸双性能涡轮盘,并对其不同部位的显微组织和力学性能进行系统的验证和分析.结果表明:采用该方法制备的全尺寸双性能盘件不同部位的晶粒尺寸符合预测;通过改变隔热工装的尺寸和热处理保温时间可以调整盘件热处理的温度梯度;盘件晶粒过渡区晶粒尺寸过渡平缓;细晶组织的合金具有较好的低温强度,而粗晶组织的合金则具有较好的高温抗蠕变性能.
Abstract
A turbine for experiment was produced by vacuum induction melting+powder preparation+hot isostatic pressing+hot extrusion+isothermal forging processes.Samples were taken from the experimental disk for heat treatment tests and mechanical properties tests to determine sub-solvus and super-solvus heat treatment temperature ranges and mechanical property evolution rules of the FGH4113A alloy.In addition,thermal boundary conditions for simulation calculations were obtained through experiments.A method for designing heat treatment processes for full-size turbine disk components based on experiment and finite element analysis was proposed.Using this method,a full-size dual-microstructure turbine disk was successfully fabricated,and the microstructure and mechanical properties of the disks were verified and analyzed at various disk locations.The results show that the grain sizes of the full-size dual-microstructure disk match the predictions;by adjusting the thermal insulation size and holding time during heat treatment,the temperature gradient can be modified.The grain size transition zone exhibits a smooth change;fine-grained structures are in favor of low-temperature strength,while coarse-grained structures provide better resistance to high-temperature creep.
关键词
镍基粉末高温合金/双性能热处理/显微组织/有限元分析Key words
nickel-based superalloy/dual-microstructure heat treatment/microstructure/FEM引用本文复制引用
基金项目
国家科技重大专项(2017-VI-0009-0080)
广东省引进创新创业团队项目(607264877417)
深圳市工业和信息化局项目(201806071114243770)
出版年
2024
NETL
NSTL
万方数据